Gradle, JS, webpack: escape strings inside webpack config

#KT-31985

libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/targets/js/webpack/KotlinWebpackConfigWriter.kt

@@ -200,10 +200,10 @@ data class KotlinWebpackConfigWriter(
             """
                 // entry
                 if (!config.entry) config.entry = [];
-                config.entry.push('${entry.canonicalPath}');
+                config.entry.push(${jsQuotedString(entry.canonicalPath)});
                 config.output = {
-                    path: '${outputPath.canonicalPath}',
-                    filename: '${entry.name}'
+                    path: ${jsQuotedString(outputPath.canonicalPath)},
+                    filename: ${jsQuotedString(entry.name)}
                 };
                 
             """.trimIndent()